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The one thing I look for in a purchase is the company and how well they stand behind their product.
Given the commonality of the components, the technology standardized, there is not much to decide where the unit is concerned.

How is their customer service and durability of the product they sell?
Do they handle any issues associated with the unit well?

Other than that, you have only the model to choose to suit your needs.

Yeah, from what I can tell they all pretty much use the same components. You could look up for the review on a certain pump or motor. The various companies might make their own frames Etc I would want to know exactly what pump is on there. If you can't find much information on the pump they use or the motor, I would be pretty skeptical.